Answer:
D
Step-by-step explanation:
Answer:
Option C is correct.

Step-by-step explanation:
Given the expression: 
Using properties of summation:
Using properties of summation in the given expression we have;
= 
=
Therefore, the following given expression uses the properties of summation to represents is, 
Answer:
1386
Step-by-step explanation:
V=πr²*h
V=22/7*7²*9
V=1386
15 students have roles and 25 do not I hope this is right or at least helps :)